Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4512363 | Slide valve | Frank J. Jandrasi, Walter J. Stinson | 1985-04-23 |
| 4291764 | Well casing scraping apparatus | — | 1981-09-29 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4512363 | Slide valve | Frank J. Jandrasi, Walter J. Stinson | 1985-04-23 |
| 4291764 | Well casing scraping apparatus | — | 1981-09-29 |